eClass and Canvas Support
Knowledgebase: eClass (Read-Only) > eClass For Instructors > eClass Basics (For Instructors) > eClass Technical issues
File Upload Error - JSON String
Last modified on 15 August 2025 01:04 PM
NOTICE: Please be advised that the content of this article may only be relevant for users concluding the final stages of course work on eClass or for users on the eClass External system. The eClass Learning Management System is currently in a read-only state that prohibits new courses, enrollments, and users from being added to the site. Credit courses and co-curricular courses at the UofA are now being delivered on Canvas, and full articles on how to use Canvas can be found here.

On rare occasions, users may encounter the error 'Invalid JSON string' when trying to upload files. Possible reasons for this include:

  • Internet Explorer. Instead, try uploading the file with one of the recommended browsers for eClass.
  • Uploading a file greater than the course upload limit. This is a course setting with a default of 100 MB. You may need to find an alternative way to upload large files if it exceeds the maximum, i.e. file compression, Google Drive, etc.
  • Filenames containing special characters. Rename these files to exclude them and try again.
(116 vote(s))
Helpful
Not helpful
-->